RECORD: Darwin, C. R. 1877.09.11-11.06. Ripe purple grapes. CUL-DAR67.9-10. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 3.2023. RN1

NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin.

The volume CUL-DAR67 contains notes on 'bloom'. Francis Darwin explained: "His researches into the meaning of the 'bloom,' or waxy coating found on many leaves, was one of those inquiries which remained unfinished at the time of his death. He amassed a quantity of notes on the subject". LL3: 339. See an Introduction to these folders by Christine Chua & John van Wyhe.


[9]

1877

Ripe purple grapes. Hot-Hou Vinery

Sept 11th 5˚ P.m. cleaned sponged 8 & put other 8 with bloom in bottle in distilled water — Kept bottle on chimney piece in study at temp vary from 67° to 71° F.

On 14th many bubbles of air proceeded from the cleaned ones as often as shaken. — At 10˚ P.m. fluid looked purplish but was doubtful.

15th 7˚ A.m. fluid in which cleaned grapes were purplish, acid & sweet & 6 of the grapes burst out of the 8 burst with great chasm on one side.

None of grape with bloom burst & most of them when blown were partially dry though in bloom not quite removed. — The cleaned ones, I thank, tasted rather more fermented than the others those with bloom. — (There must be great endosmose, so wide wide were the [illeg] on the cleaned ones.) William & Frank tasted Franks grapes & concluded that the cleaned ones were the best tasted, but seem most watery. They have a vinous taste & it was when those with bloom were cleaned that the difference in taste came out plainest. Certainly not much difference in taste. The ruptured grapes could not last long — It is said that plain rupture after much rain.

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Ripe grapes (purple) 1877

I think there is other paper somewhere

Sept 11th 5˚ 15' P.m. — 8 clean & 8 with bloom put to dry first in window & then on my chimney piece.

Sept 23d The cleaned some have 1 side a little flattened

Sept 28th 4 of the cleaned ones much & a 5' a little shrunk, none with bloom clearly so, though no doubt have lost considerably by evaporation.

(— 29th all 6 6 of the cleaned much indented, only 1 with bloom very slightly indented.) (Oct 4th all on both sides indented but great difference between the 2 lots.)

Nov. 6th Handed over to Frank to weigh & thoroughly dry

do. date 8 + 8 to be syringed.

Sept 20' 1 with bloom mouldy & rotten

― 22' 1 do cracked & rather mouldy.

― 23d several with mould growing on them!

24th 4/6 with mould Bloom seem to make a bed for mould to grow— not one of cleaned burst or mouldy

― 25' grapes with bloom in same rotative state

27' do. do— Cut one 2 of each open; the juice of mouldy ones taste mouldy, & whole cut surface looks rather more disintegrated.

29' 2 more grapes with bloom miserably mouldy & decayed none of the cleaned ones moldy.

Oct 6. one with bloom somewhat mouldy.

(Oct. I' The latter very mouldy & thrown away, one cleaned rotten on one side)

(over)

[10v]

(a) Oct. 4' 8˚ 30 2 of the cleaned grapes mouldy

Oct 6 9˚ 2 of the cleaned rotten & mouldy

do 1 on each side not mouldy or rotten cut open & threw away — The one with bloom tasted, I think, more mouldy


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Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)

File last updated 14 June, 2023